71808 CD/P4QBTM
71800 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71808 CD/P4QBTM Bearing Product Overview & Core Advantages
The 71808 CD/P4QBTM is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This bearing is supplied as a Quadruplex Tandem Back-to-Back (QBT) matched set, delivering superior performance in handling combined loads and providing maximum system stiffness. Its P4 tolerance class ensures high running accuracy, making it ideal for high-speed spindles and other precision machinery where reliability is critical.
Model Code Breakdown
- 71808: Basic bearing series and size designation (40mm bore, 52mm OD, 28mm width).
- CD: Indicates a 15° contact angle, optimized for high-speed operation and rigidity.
- P4: Denotes a high-precision tolerance class for superior running accuracy.
- QBTM: Specifies a Quadruplex Tandem Back-to-Back (QBT) matched arrangement of 4 bearings, pre-lubricated for immediate use.
71808 CD/P4QBTM Bearing Structural Features & Performance Benefits
This bearing's performance is derived from its specific construction and material selection:
- High Rigidity & Load Capacity: The Quadruplex Tandem Back-to-Back (QBT) arrangement provides exceptional system stiffness, enabling the bearing set to withstand significant combined radial and axial loads.
- Precision & High-Speed Capability: Manufactured to P4 tolerance standards with a 15° contact angle and a lightweight phenolic resin cage, this bearing is engineered for smooth operation at high rotational speeds, with a limiting speed of 56,000 rpm.
- Optimized for Preload: The design is intended for preload application, which eliminates internal clearance, increases bearing rigidity, and enhances rotational accuracy.
- Pre-lubricated & Ready for Use: The set comes pre-lubricated, simplifying installation and ensuring immediate, reliable performance.
71808 CD/P4QBTM Bearing Typical Application Areas
The 71808 CD/P4QBTM is ideally suited for high-precision, high-speed applications, including:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- High-Speed Machining Centers
- Other equipment requiring a matched set of precision bearings for maximum rigidity and accuracy.
